“1. Don’t interfere with, or object to, his going out with his men friends, when he wishes to do it. His desire for this is deeper than his own understanding.
2. Inject an element of uncertainty in your relations with him. Don’t give yourself too easily. Attract him constantly with every means, then give him the satisfaction of a little struggle before he makes his conquest.
3. Cater to his idiosyncrasies! Such odd desires are not all abnormal, and you need not let any element of fear or shame interfere.
Follow these rules faithfully, and you will be well insured against marital infidelity.”
I’m fairly certain that the author didn’t intend this to sound as kinky as it does.